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Theorem eldmcoss 35730
Description: Elementhood in the domain of cosets. (Contributed by Peter Mazsa, 29-Mar-2019.)
Assertion
Ref Expression
eldmcoss (𝐴𝑉 → (𝐴 ∈ dom ≀ 𝑅 ↔ ∃𝑢 𝑢𝑅𝐴))
Distinct variable groups:   𝑢,𝐴   𝑢,𝑅   𝑢,𝑉

Proof of Theorem eldmcoss
StepHypRef Expression
1 dmcoss3 35725 . . 3 dom ≀ 𝑅 = dom 𝑅
21eleq2i 2904 . 2 (𝐴 ∈ dom ≀ 𝑅𝐴 ∈ dom 𝑅)
3 eldmcnv 35634 . 2 (𝐴𝑉 → (𝐴 ∈ dom 𝑅 ↔ ∃𝑢 𝑢𝑅𝐴))
42, 3syl5bb 285 1 (𝐴𝑉 → (𝐴 ∈ dom ≀ 𝑅 ↔ ∃𝑢 𝑢𝑅𝐴))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 208  wex 1780  wcel 2114   class class class wbr 5052  ccnv 5540  dom cdm 5541  ccoss 35485
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2793  ax-sep 5189  ax-nul 5196  ax-pr 5316
This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-rab 3147  df-v 3488  df-dif 3927  df-un 3929  df-in 3931  df-ss 3940  df-nul 4280  df-if 4454  df-sn 4554  df-pr 4556  df-op 4560  df-br 5053  df-opab 5115  df-cnv 5549  df-co 5550  df-dm 5551  df-rn 5552  df-coss 35691
This theorem is referenced by:  eldmcoss2  35731  eldm1cossres  35732
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